senator harry reid, the majority leader, says whatever investigation should go forward, but he backs bob menendez. savannah? >> kelly o'donnell on the hill for us. now here's matt. >>> gas prices are rising again this morning, the national average jumping another cent overnight to 3.53 for unleaded regular. also a 17-cent hike in just a week. tom costello takes a look at the reasons why. tom, good morning. >> reporter: good morning, matt. yes, we hear you in california and new york and illinois and vermont. we know you're paying a lot more there, of course. you can blame a lot of things here. for the beginning, refinery shutdowns, a shift over to summer blends and a perception on wall street that the economy is picking up. it is all the talk from coast to coast, those pump prices. >> i don't even want to like know the amount at the end of the week because i don't want to get depressed. >> i'm going to drive a lot less for now, i know that for sure. >> you're wasting like 60 bucks a week. >> reporter: several refineries are down for maintenance, a supply shortage in california, oil pr